National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

St Clair County International Airport (KPHN)

Lat: 42.91°NLon: 82.53°WElev: 636ft.

Overcast

66°F

19°C

Humidity 88%
Wind Speed Calm
Barometer 30.24 in
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 17 Sep 12:55 pm EDT
Extended Forecast for

3 Miles SE Casco MI

  • This Afternoon

    This Afternoon: Partly sunny, with a steady temperature around 72. North wind around 6 mph.

    High: 72 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 55. North wind 3 to 6 mph.

    Low: 55 °F

    Decreasing
    Clouds

  • Friday

    Friday: Increasing clouds, with a high near 73. North northeast wind 5 to 9 mph.

    High: 73 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 56. North northeast wind 3 to 8 mph.

    Low: 56 °F

    Mostly Cloudy

  • Saturday

    Saturday: Showers. High near 68. East southeast wind 5 to 9 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    High: 68 °F

    Showers
    Likely then
    Showers

  • Saturday Night

    Saturday Night: Showers before 8pm, then showers and possibly a thunderstorm between 8pm and 11pm, then showers after 11pm. Low around 57. Chance of precipitation is 90%.

    Low: 57 °F

    Showers

  • Sunday

    Sunday: A chance of showers before 2pm. Mostly cloudy, with a high near 68. Chance of precipitation is 40%.

    High: 68 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 51.

    Low: 51 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 65.

    High: 65 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
Partly sunny, with a steady temperature around 72. North wind around 6 mph.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 55. North wind 3 to 6 mph.
Friday
Increasing clouds, with a high near 73. North northeast wind 5 to 9 mph.
Friday Night
Mostly cloudy, with a low around 56. North northeast wind 3 to 8 mph.
Saturday
Showers. High near 68. East southeast wind 5 to 9 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Saturday Night
Showers before 8pm, then showers and possibly a thunderstorm between 8pm and 11pm, then showers after 11pm. Low around 57. Chance of precipitation is 90%.
Sunday
A chance of showers before 2pm. Mostly cloudy, with a high near 68. Chance of precipitation is 40%.
Sunday Night
Mostly cloudy, with a low around 51.
Monday
Mostly cloudy, with a high near 65.
Monday Night
Mostly cloudy, with a low around 51.
Tuesday
Partly sunny, with a high near 68.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 55.
Wednesday
A chance of showers. Partly sunny, with a high near 72.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SE Casco MI
 42.74°N 82.64°W (Elev. 623 ft)
Last Update:
10:13 am EDT Sep 17, 2026
Forecast Valid:
1pm EDT Sep 17, 2026-6pm EDT Sep 23, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation